Machine for slitting and bending sheet metal.



C. RBHBBIN. MACHINE EOE SLITTING AND BENDING SHEET METAL.

'APPLIGATIO FILED MAR.18, 1914. 1,1 1 8,232-

Patented N ov. 24, v1914 C. REHBEIN. MACHINE FOR SLITTING AND BENDING SHEET METAL.

APPLICATION FILED MAR. 18, 1914.

- Patented Nov. 24, 1914.

I x I "WIWI :s MNHN@ c. RBHBEIN. AMACHINE POR SLITTING AND BENDING SHEET METAL. APPLICATION FILED MAR.18,1914.

Ll Patented N0v.24,1914.

4 SHEETS-SHEET 3.

, www

C. RBHBEIN.

MACHINE FOR' SLITTING AND BENDING SHEET METAL.

APPLIGATION FILED MAR.18, 1914. 1 11 8,232, Patented Nov. 24, 1914.

4 SHEETS-SHEET 4.

IIITE srarns CONRAD EEHBEIN, 0E DETROIT, MICHIGAN.

MACHINE Eon sLITTING AND BENDING SHEET METAL.

iaiaese.

T0 all whomy it may con 61%.

Be it known that I, lCONRAD REHBEIN, a

citizen of the United States, and a resident of Detroit, in the county of Vayne and State of Michigan, have'invented a new and Improved Machine for Slitting and Bend- Specication of Letters Patent.

`Patented Nev. ea, 1era,

Application filed March 18, 1914. Serial No. 825,466.

In Fig. 1, a stationary bed 1 is carried by the frame 2, which has guides. 3 in which the "vertically movable head 1 is slidable.A

Any desired means may be employed to lmove' the-head up and down, a shaft '5 rand' vconnecting rod` y6 beingshown, the parts being Sheet Metal, of whichthe following is u a specification.

This invention relates to means for feed-. ing, slitting and bending portions of rib'- bons or bands of thin sheet metal at regular intervals, and its object is to provide a slitting and bending press that will accurately space the perfor-ations and bent up portions of the material acted upon.

This invention consists of a positive `feedl tails of construction set forth inthe draw-4 ings and particularly pointed out in the claims. y

In the accompanying drawings, Figure 1 is a front elevation of this improved machine. Fig. 2 is a plan 'of the support for the roll of metal ribbonto be slitted and bent; Fig. 3 is a plan of the tableand lower die. Fig. er. is a front elevation of the upper and lower dies,` the front of the latter being broken away to show the supporting springs of the stripper plate. Fig. 5 is a side elevation ofthe dies. Fig. 6 is a section on the line ILL-A of Fig. Fig. 7 is a plan of the upper die. Fig. 8 is a transverse section of the dies at one of the stripper pins on a larger scale. Fig. 9 is a .similar section through the bifurcated die. Fig. lOlis a perspective of the Yupper or female die. Fig. 11 is a perspective of the lower or male die. Fig. 12 is a perspective of a portion of the upper die. Fig. 13 is a. perspective view of the nished material.

" of any desired construction, as this improved mechanism may be attached to practically all types of vertical presses nowon the market.

ing 'at the upperlimitof their movement. On the bed 1 a table .7 mayy berigidly secured vor the-.two may be integral. ArmsV 8 extend to the right and carry small brackets 9 which support a shaft 10 on which the roll of sheet" metalvll of the proper width is mounted to turn freely. Bars 13 rand' 14 eX- tend across between the arms 8, and are connected by the plate 15 above which the band 11 passes to the shear. Above'the plate 15 are two adjustable guidebars 16 securedto the plate by means of the'bolts 17. Springs j 18 maybesecured to these guide bars ant bear onthe band 11 to act as brakes and t, prevent it from moving up and down. The head 4 carries a head plate 20, in which is mounted the vertically movable plunger 21 .for closing the clamp, and-to which are secured the 'cams 22 for moving the clamp 'forward The plunger has a collar :.23 to .by the arms 8.

limit its downward movement with respect to the head plate. On the head plate is secured an elongated stirrup 2,4, in which Athe spring 25 is mounted on the stem 26 of the plunger. Above the stirrup may be mounted a second spring -27 that cushions t'hle plunger when itis releasedl as hereinaftery described. A A nut 28 at the upper end of the stem receives the thrust of the spring 27. The feed-clamp is formed of two shoes 30, slidable between the linclined'guides'31 secured tothe table 7. These shoes may have contact members 32 to engage the screws 33 mounted in the cross bar 13. Springs 341, 'at the sides of the clamp, connect-to the screws 35 on the shoe and to the screws 36 carried An abutment 37 on, each shoe engages the adjacent end of the upper plate 3S, guided on the screws 39, and. held spaced apart from the shoes by means of springs 40. The shoes and upper plate may be provided with gripping members 42, which may be of ber, woodor hard rubber.

When the parts are as shown' in Figs. 1 and 5, the band 11 is loose between the shoes and top plate of the clamp. WVhen the head plate descends, the plunger 21 engages the top plate 38 and the spring 25 forces the plate `38 down until the members 42 firmly grip the band of metal. Immediately after determined position' from. a pointv deter- 'mined' bythe screws The amount the band is moved forward at each stroke of the press can therefore be accurately deter- `mined.

lVhen the'head plate .QObhasreached the lowerv end of its movement, a small bolt 45,

(F ig. 5) slidable in'the'housin'g 46, and

normallyfheld toward the plunger by the spring 47 engages in a notch in theplunger,

as indicated'in Figs. 5 and 6. When the l head plate'riseathe plunger will bel-lifted" free from'th'e top plate 38 of the clamp, permitting the Vgr'ippers 42 to separate. ".When the cams 22- have/risen 'siiit'lciently, the springs 34 will move back theclamp to the positionlshown in Fig. l, where it will remainun'tilfthe head ofthe pressagain de- *scendev f l J On the upstrokeof the head plate 20? a cam 77, mounted on theffra'me 2 will engage the iinger 7 8'on the bolt 45, and just'after the clamp has been movedV back by theV springs 34, the bolt 45 will bewithdrawn, permitting the spring' 25 to force the plunger downward. At this time, the spring 27 acts ,as a- Cushion.

This machine is especially designed to produce a slittedf strip or' band of sheet metal such as shown in Fig. 13, Where great accuracy of spacing is required. rll`he metal is to be used to form the radiating fins of cellular radiators-adapted for automobiles, the fins being placed between and soldered to thin widel tubes. These fins 50 connect to cross Vbars 5l, which in turn connect to the' veach fin 50, in which position they are soldered. The openings between these lips 54 constitute the apertures for the circulating air, the iins 50 extending horizontally into the current of air. The `third longitudinal bar 55 is bent to. lieagainst'the ends of Lthe lips 54 parallel to the bar 53.

The bandll passes over the stripper plate 56 and the support 57. The stripper plate is mounted on the springs 58 and is guided on the pins 59. It is provided with one Yslot 60 for the long cutter 6l to form the iins 50 and another slot 64 to permit the passa-ge of the bifurcated die 65.

' Thedie holders 7 0 and 7l rest on vthe table 7 and grip the dies 61 and 65, being forced together by means of the wedge 72 and the inclined abutments 73 and 74. The upper die is preferably formed of three pieces, the body 66, the short die 67 and the plate 68. The width of the slot between the plate 68 arianna and the edge 69 is greater than the" thickness ofthe cutter G1, as shown in Fig. 8, s o that the fins 50 will remain attached to the cross bars 5l. The short die 65 that forms the n lips 54 co-acts with the female die 67. rlhe ofthe metal between the li'ps 54, as shown in Fig. A9, thus properly bending these lips inthe groove between the members 81.

As lshown in Fig. 4, the upper surface of 'the stripper plate is normally at the same 'height as the cutting edges of the shear members 61 and 81, and is preferably a short distance above the level of the lower grippers-42. When the head plate and upper dies descend, the plunger 2l. first forces the clamp to grip the band 11. The cams 22 then move the clamp and band forward one space, and hold them there. The upper die then engages the band and stripper plate 56 and forces them down, the die 61 cutting 'free a iin 50 and the bifurcated die cutting out two lips 54. At the same time,` the beveled lower edge of the plate 68 will straighten the next previously formed iin 50, should that lean outwardly.

At the last portion of the stroke of the head, the stripper pins 86, mounted in the body 66, as shown inv Fig. 8-and indicated in Fig. 7, engage the band 11, and are eompressed against the tension ofthe springs 87, held in place by the screw plugs 88. when the head rises, these pins will force down the band l1 and disengage the fins 50 and lips 54 fromthe upper dies. The clamp is returned by the springs 14 to starting position and the machine is ready to go through the next cycle of its operation.

rlhis device may be changed in many detailsrby competent designers without departing from the spirit of vmy invention as expressed in the claims.

I claim:

1. In a slitting and bending machine for sheet metal, the combination of a spring mounted supporting` plate for the sheet metal having perforations, a narrow slitting die extending up into one of the-perforations, a second die extending vup into anL sheet metal, the combination of a table, a

spring'mounted supporting plate for the sheet metal having perforations, a narrow male-'i slitting and bending die supported by the table and extending through said plate,

a rectangular die mounted adjacent the slitting die and having a transverse groove in line with the rear side of the slitting 'di e,

and a female die movable toward and from the stationary dies and having shearing edges to vco-act with the shearing edges of thestationary dies and a blade to extend into the gr'oove of the rectangular die.

3.- In a slitting and bending machine for sheet metal, thecombination of a frame, a

table mounted thereon, a' head vertically' head to engage and movev the clamp to feed the sheet metal, and dies to slit and bend the sheet metal.

4. In a slitting and bending machine for sheet metal, the combination of a frame, a table mounted thereon, a head vertically slidable infthe frame, a clamp slidably mountedon the table comprising a pair of shoes and a plate carried by the shoes, and springsto normally separate the plate from the shoes, applunger slidably mounted on the head, a guide for'theplunger so that -it .may have vertical movement, a spring to force the plunger downwardly to press the members of the clamp together, means to engage thel plunger when the head has vreached the lower limit of its movement and cause the plunger to rise with the head, means to release the plunger as the head reaches the upper limit of its movement, and

a cam on the head to move theclamp when engaged by the plunger.

the combination of a frame, aA vertically movable head slidably mounted in the frame,

a` table supported `by the frame, a longitudinally movable clamp mounted on -thetable and comprising upper and lower members normally held apart betweenwhich In a 'slitting machine forsheet metal,

the sheet metal may pass, a vvertically mov iable'plunger mounted on the head, a guide for the plunger, a spring to force down the` p lunger-against the upper member of the' clamp when the head hasmoved down- 55 ward in its operative stroke, said springbeing compressed as the head descends after the plunger has engaged the clamp, means for moving .the clamp while engaged by the engage the plunger when the head reaches the lower limit of its movement to canse the plunger' to rise with thehead, and a cam mounted on the frame and engaging the bolt plunger as the head is descending, a bolt to 60 and adapted to release the plunger as the head reaches the upper limit of its move# ment. l

6.. In a slitting and bending machine for sheet metal, the combination of a table and table, a plunger mounted on the head to engage the clamp to cause it* to grip the sheet metal, a cam mounted on the head `to engage and move the clamp land sheet metal, a spring to return the clamp, and 7 means mounted on the head to slit the sheet metal. Y

7. In la slitting and bending machine for sheet metal, the combination of. a clamp to 'a movable head, a 'clamp mounted on the 70 grip the sheet metal, positive means to move 8" the clamp and sheet metal, a spring to return the clamp, and a slitting device formed v of a male and female portion, the male portion consisting of a flatshear and'of a die having atransverse groove in line with one side 0I the iiat shear, so that long liin's may be cut and bent,from the sheet metal together with pairs of. tongues which pairs of tongues remain .attached t0 the sheet metal by means of narow bars at their ad-'9o jacent ends, said bars being in linevwith said fins. v y

In testimony whereof I have signed this specification in the. presence of two subscribing witnesses.

CONRAD REHBEIN..

Witnesses: g

` A. G. GRZEZINSKI,

S. WiLKowsKr. 

